Need help understanding this method

Question

writeToFile

public static void writeToFile(double[][] data,

java.io.File outputFile)

throws java.io.FileNotFoundException

Writes the ragged array of doubles into the file. Each row is on a separate line within the file and each double is separated by a

space.

Parameters:

data - two dimensional ragged array of doubles

outputFile - the file to write to

Throws:

java.io.FileNotFoundException - if outputFile is not valid

Answer 1

import java.io.*;

class AngieARaggedOutput

{

public static void writeToFile( double [][] A, File outputFile)

{

try

{

FileWriter writer = new FileWriter (outputFile);

for (int iLoop=0; iLoop<A.length; iLoop++)

{

String outbuff=" ";

for ( int jLoop=0; jLoop<A[iLoop].length; jLoop++)

{

System.out.print(A[iLoop][jLoop] + " ");

outbuff += A[iLoop][jLoop]+ " ";

}

System.out.println(" ");

outbuff += "\n";

writer.write(outbuff);

} //for iLoop

writer.close();

}//try

catch (IOException ex)

{

}

} //writeToFile

public static void main( String args[])

{

double [][]A = { { 4,6,8,12,16,18,24,28,32,36,42,48,52,56,60,64,68,72,76,80,84,88,92,96,100},

{ 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100},

{ 4,7,11,13,18,21,23,27,31,37,43,46,49,51,53,57,61,66,69,77,83,91,99},

{ 2.718, 3.142, 3.33, 4.25, 7.11, 13.16, 19.70, 25.57, 35.42, 42.35, 53.27, 69.77}

};

File outfile = new File("doubles.dat");

AngieARaggedOutput x = new AngieARaggedOutput();

x.writeToFile(A,outfile);

}

}